过冷熔体中非等温凝固枝晶生长相场法模拟  

Numerical Simulation on Non-isothermal Dendritic Growth of Undercooled Melt Using Phase-field Method

作　　者：魏涛[1,2] 郭洪民[2,3] 杨湘杰[1,2] 

机构地区：[1]南昌大学机电工程学院,江西南昌330031 [2]江西省高性能精确成形重点实验室,江西南昌330031 [3]南昌大学材料科学与工程学院,江西南昌330031

出　　处：《热加工工艺》2013年第1期41-44,47,共5页Hot Working Technology

基　　金：国家自然科学基金资助项目(50965015;50804023);教育部重点项目(212091);江西省教育厅科技项目(GJJ12036)

摘　　要：基于二元合金相场模型,建立了耦合溶质场和温度场的相场模型。采用有限差分法对控制方程进行了数值求解,模拟了Al-Cu二元合金非等温凝固时枝晶生长过程,研究了过冷度对等轴枝晶生长行为的影响。结果表明:过冷度越大,枝晶的侧向越发达,甚至三次枝晶出现,枝晶尖端生长速度越大,计算范围内温差越大。A phase-field model coupling with solute field and temperature field was established based on the binary phase-field model. The control equation was numerically solved with finite difference method. The dendritic growth in A1-Cu binary alloy non-isothermal solidification was simulated. And the effect of undercooling on the dendritic growth was studied. The results indicate that the larger undercooling, the rapider growth of dendrite and the larger temperature difference, the more lateral dendrite increasingly developed, even three times dendrite appear.

关 键 词：相场法 非等温凝固 枝晶生长 数值模拟 

分 类 号：TG244[金属学及工艺—铸造]